The Truman Doctrine

On Dec. 31, 1946, President Truman declared an end to the period of
World War II hostilities. Early in 1947 the British said they could
not support the Greek government after March 31. Many diplomats feared
that the Soviet Union would then spread its power throughout the
Middle East. President Truman met the problem by asking Congress for
400 million dollars to aid Greece and Turkey. Congress appropriated
the money. This policy of aid, popularly known as the Truman Doctrine,
was an American challenge to Soviet ambitions throughout the world.

Compare this version to that
offered by Howard Zinn in A People's History.